Abstract: A method of controlling the power consumption of a light source in a mobile projector, including calculating power consumption of the light source, and comparing the calculated power consumption with a preset power value, and automatically adjusting current flowing to the light source according to a resultant value of the comparison. Calculating power consumption of the light source includes measuring a voltage applied to both terminals of the light source, measuring current flowing to the light source, and calculating power consumption of the light source by multiplication of the measured voltage and current. Adjusting the current flowing to the light source includes calculating a difference between the preset power value and the calculated power consumption of the light source, adding/subtracting the calculated difference value to/from a preset current value to output a resultant value, and changing the voltage output to the light source according to the resultant output value.

Abstract: A light source driving apparatus is disclosed which includes a power supply including a power supply terminal connected to a first path through which a power source is supplied to a light source and including a feedback terminal for receiving a feedback of the power source supplied to the light source, a feedback resistor connected to the feedback terminal, and a current divider for branching a current flowing into the first path and supplying the branched current to the feedback resistor.

Abstract: A method of displaying image data is provided, which includes analyzing histograms by color signals of an input image frame; confirming grayscales by color signals in a predetermined frame unit with reference to the analyzed histograms; determining dimming factors in consideration of maximum grayscale values of the grayscales; determining image gains of the image data by color signals using the determined dimming factors; and outputting an image signal by applying the image gains to the input image and applying the dimming factors to a light source.

Abstract: A light source driving apparatus for sequentially driving a plurality or light sources is provided. The light source driving apparatus includes a light source power supply for supplying a power source necessary for driving the plurality of light sources, a light source controller for generating a control signal to sequentially turn on and off the plurality of light sources, a soft starter connected between the light source power supply and the light sources, for delaying the power source generated from the light source power supply for a first determined time and supplying the delayed power source to the light sources, and a control signal delayer connected between the light source controller and the light sources, for delaying an ON signal of the control signal generated from the light source controller for a second predetermined time and supplying the delayed signal to the light sources.

Abstract: Provided is a light emitting device of an electronic device, provided with a DLP (Digital Light Processing) projector and a display unit, which is configured in such a manner that the light generated by the operation of the DLP projector can be re-used as a backlight light of the display unit. The disclosed light emitting device includes a first mirror for projecting a light of the DLP projector on a flat area provided ahead of the first mirror in an intermediate operation state of the first mirror; a light concentration mirror for converging the light projected on the flat area, the light concentration mirror being provided at a position adjacent to the flat area; and an optical fiber for transferring the light converged by the light concentration mirror to the display unit and enabling re-use of the transferred light as a light for a backlight of the display unit.

Abstract: A method and apparatus for calibrating a color temperature of a projector that creates a light of a desired color by mixing primary lights. The method includes setting target values for the mixed light, measuring color coordinate values for the primary lights, calculating the target brightness values for the primary lights using the target values and the measured color coordinate values, and calibrating the output of the primary lights output from the projector based on the calculated target brightness values.

Abstract: An image scanning apparatus for embodying an image using visible lights apparatus includes a scanning unit for irradiating line scan light; a power source for generating voltage for driving the scanning unit; a light detector for detecting duty that is a variation ratio of line scan light with respect to time; and a servo-loop for comparing the detected duty with a preset value, calculating a magnitude of the voltage for driving the scanning unit, and applying voltage, which is controlled depending on the calculated voltage magnitude, to the scanning unit.

Abstract: An optically pumped semiconductor laser and an optical pumping method are disclosed. The optically pumped semiconductor laser includes an output mirror and a reflective mirror for forming a resonant region therebetween, a gain medium disposed between the output mirror and the reflective mirror and a light source for applying a source light in a direction between the output mirror and the gain medium to activate the gain medium, whereby the optical axes of the light from the source light and the light generated from the gain medium are substantially perpendicular to each other and the optical axes of a second harmonic generated from a nonlinear crystal is substantially equal to the optical axis of the light generated from the gain medium.

Abstract: A light source driving circuit and method is provided. The light source driving circuit includes a light source for outputting light, a light receiving unit for detecting a portion of the light output from the light source, a switching unit for controlling the supply of a source voltage according to an operation control signal, a constant current source for supplying a current corresponding to a threshold current to the light source according to the control of the switching unit, and an automatic power controller for controlling a driving current of the light source in response to an external modulation signal. Accordingly, by supplying a current corresponding to a threshold current of a green laser by means of a switching operation according to an operation control signal for a set time before a modulation signal of the green laser is input, a turn-on delay of the green laser can be reduced.

Abstract: An integrated circuit is provided for driving a light source. The light source outputs light. A light receiver receives part of the light output from the light source. In response to a detection current from the light receiver, an automatic power controller adjusts an operating current of the light source. A power converter efficiently supplies power from a power supply to the light source. A modulation signal input unit inputs a modulation signal for modulation of light output power. This circuit structure performs a control operation for constantly maintaining the intensity of light even in a variation in an ambient temperature or deterioration in the light source and also reduces power consumption in the integrated circuit for driving the light source.

Abstract: A transistor-outline TO-can type optical module includes a stem, a sub-mount arranged in the stem and a laser diode (LD) is mounted in the sub-mount. A photo diode (PD), which has an inclined light incident surface, converts light emitted from the LD to current. A plurality of leads is extended through the stem while electrically being connected to the sub-mount. The inclined light incident surface of the PD permits that sufficient monitoring of photocurrent can be obtained and a p-side up bonding of a p-type electrode is allowed. Thus, the SMSR of the LOB is increased. A bias-tee is built in the TO-can to reduce heat caused by DC current and to increase opto-electric efficiency while suppressing an increase in the temperature of an LD chip.

Abstract: A drive structure is provided for a sequential Red-Green-Blue (RGB) display. One light receiving means receives part of light output from R, G, and B light sources and performs conversion to a current signal. Each light source driver performs a control operation for maintaining the light intensity of each light source substantially constant by adjusting an amount of operating current applied thereto according to the magnitude of a feedback current provided from the light receiving means. Light is sequentially emitted by the light sources and received by the light monitoring device in response to input R, G, and B modulation signals.

Abstract: An apparatus and method for blocking laser beams using a human body sensor in an image projector includes the steps of: monitoring, using the human body sensor, in a projected direction in which the image projector projects on a screen laser beams corresponding to a predetermined image; when an obstacle is sensed on the screen of the projected direction, measuring a temperature value of the obstacle by absorbing infrared (IR) rays emitted by the obstacle; comparing the measured temperature value of the obstacle to a pre-set temperature range; and if the measured temperature value of the obstacle is within the pre-set temperature range, blocking the laser beams corresponding to the predetermined image by stopping driving the image projector.

Abstract: An image scanning apparatus for embodying an image using visible lights apparatus includes a scanning unit for irradiating line scan light; a power source for generating voltage for driving the scanning unit; a light detector for detecting duty that is a variation ratio of line scan light with respect to time; and a servo-loop for comparing the detected duty with a preset value, calculating a magnitude of the voltage for driving the scanning unit, and applying voltage, which is controlled depending on the calculated voltage magnitude, to the scanning unit.

Abstract: An optically pumped semiconductor laser and an optical pumping method are disclosed. The optically pumped semiconductor laser includes an output mirror and a reflective mirror for forming a resonant region therebetween, a gain medium disposed between the output mirror and the reflective mirror and a light source for applying a source light in a direction between the output mirror and the gain medium to activate the gain medium, whereby the optical axes of the light from the source light and the light generated from the gain medium are substantially perpendicular to each other and the optical axes of a second harmonic generated from a nonlinear crystal is substantially equal to the optical axis of the light generated from the gain medium.

Abstract: An optical element module package with a TO-can structure is disclosed. The module includes a laser diode for projecting optical signals and a photo diode for monitoring the optical signals projected from the laser diode. The package includes a stem having a first through-hole formed in a long-hole shape parallel to the diametrical direction of the stem, the first through-hole extending through the stem from one side to the other; and a plurality of leads arranged in a row through the first through-hole. The first through-hole is filled with a sealant of a glass material so that the stem and the leads are fixed.

Abstract: An optical module having a TO-can structure is disclosed, wherein frequency characteristics have been improved in order to make high-speed transmission possible. The optical module comprising a silicon optical bench wherein a V-groove is formed, a laser diode disposed on the V-groove of the silicon optical bench, which emits light, a photo diode which receives the light and converts it into current, a stem wherein the silicon bench and the photo diode have been disposed, and a plurality of leads coupled to the stem, to provide electric signals with the laser diode and the photo diode.

Abstract: A transistor-outline TO-can type optical module includes a stem, a sub-mount arranged in the stem and a laser diode (LD) is mounted in the sub-mount. A photo diode (PD), which has an inclined light incident surface, converts light emitted from the LD to current. A plurality of leads is extended through the stem while electrically being connected to the sub-mount. The inclined light incident surface of the PD permits that sufficient monitoring of photocurrent can be obtained and a p-side up bonding of a p-type electrode is allowed. Thus, the SMSR of the LOB is increased. A bias-tee is built in the TO-can to reduce heat caused by DC current and to increase opto-electric efficiency while suppressing an increase in the temperature of an LD chip.

Abstract: An optical element module package with a TO-can structure is disclosed. The module includes a laser diode for projecting optical signals and a photo diode for monitoring the optical signals projected from the laser diode. The package includes a stem having a first through-hole formed in a long-hole shape parallel to the diametrical direction of the stem, the first through-hole extending through the stem from one side to the other; and a plurality of leads arranged in a row through the first through-hole. The first through-hole is filled with a sealant of a glass material so that the stem and the leads are fixed.

Abstract: An optical module having a TO-can structure is disclosed, wherein frequency characteristics have been improved in order to make high-speed transmission possible. The optical module comprising a silicon optical bench wherein a V-groove is formed, a laser diode disposed on the V-groove of the silicon optical bench, which emits light, a photo diode which receives the light and converts it into current, a stem wherein the silicon bench and the photo diode have been disposed, and a plurality of leads coupled to the stem, to provide electric signals with the laser diode and the photo diode.